For the first 20 years of his active career, Redon worked almost entirely in black, using charcoal and grease pencil and eventually producing lithographs of images as dark as their media.

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Sandy had several large portraits of the heroic aviator, in both pencil and charcoal, stowed away in his portfolio.

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First, acquire some sort of marking device: pen, pencil, charcoal or gouging stick.

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Both exhibitions have a lot to teach us about an array of materials used on paper, from pencil and charcoal to pastel and watercolor, while the examples from the Clark are also instructive about diverse print techniques, from woodcut to lithography a hot new medium for late 19th-century artists.

WSJ: Fine Lines | Frick Collection | Brooklyn Museum | by Karen Wilkin